"Bumping"?

From the Des Moines Register:

Texas coach Jerritt Elliott was given a yellow card – a warning for unsportsmanlike behavior – for bumping an official while arguing a call in the third set.

Really? Do we have confirmation on this? How is it possible that no one has mentioned this yet? Is Jerritt Elliott the Earl Weaver of volleyball? Was it a legitimate bump or more of a hip check? Did Elliott kick dirt at the ref? Or were he and the down ref just exchanging contact info on their iPhones?